2 Feb
2003
2 Feb
'03
11:49 p.m.
G'day all. On Fri, Jan 31, 2003 at 09:08:22AM +0100, Ralf Hinze wrote:
John Hughes wrote a nice pearl on the subject, see
Nice! Why isn't RefMonad in hslibs? Possibly because of the class signature: class Monad m => RefMonad m r | m -> r where {- etc -} It makes perfect sense for there to be more than one kind of "ref" for a given monad. Indeed, sometimes it's important. Quite often, I use a custom ref built on top of IORef which supports Ord, as this is needed for hash consing. Cheers, Andrew Bromage